Credits & Attributions

Cerebra is built with the following open-source and openly-licensed works.

Software libraries

• D3.js v7 — ISC License, © Mike Bostock. d3js.org
• TopoJSON Client v3 — ISC License, © Mike Bostock. github.com/topojson
• Tone.js — MIT License, © Yotam Mann & contributors. tonejs.github.io
• Flubber v0.3.0 — MIT License, © Noah Veltman. github.com/veltman/flubber

Coding platform (computers section)

• Pyodide (CPython for WebAssembly), core distribution — Mozilla Public License 2.0, © Pyodide contributors. Powers the in-browser Python engine. pyodide.org
• wasm-clang (a clang/LLVM toolchain compiled to WebAssembly) — Apache License 2.0, © WebAssembly Community Group participants. The bundled LLVM binaries (clang, lld) and C/C++ standard library are licensed Apache 2.0 with the LLVM exception. Powers the in-browser C and C++ engines. github.com/binji/wasm-clang

Fonts

• Nunito — SIL Open Font License 1.1, © The Nunito Project Authors.
• Share Tech Mono — SIL Open Font License 1.1, © Carrois Apostrophe.

Audio

• Salamander Grand Piano samples — CC BY 3.0, by Alexander Holm (packaged via the midi-js-soundfonts project). CC BY 3.0
• Acoustic piano samples (88-note set) — from the midi-js-soundfonts project (MIT). [[ Confirm whether MusyngKite or FluidR3_GM and note its terms. ]]

Maps & geographic data

• Natural Earth vector data (country/state boundaries) — public domain, packaged as TopoJSON via the world-atlas / us-atlas projects (ISC). naturalearthdata.com

Flags

• Country & territory flag images (all 252 PNGs served from static/core/flags/, self-hosted) — downloaded 2026-07-18 from Flagpedia.net via its FlagCDN service (320-pixel PNG set, ISO 3166 codes). Flagpedia offers these images free of charge for any commercial or non-commercial use without attribution required; this credit is provided with thanks. The underlying national flag designs are public domain.

Full license texts are included with the source in NOTICES.md.